Disazo dyestuffs



Patented Apr. 3, 1951 DISAZO DYESTUFFS Peter Hindermann, Basel, Switzerland, assignor to J. R. Geigy A. G., Basel, Switzerland No Drawing. Application September '7, 1948, Se-

rial No. 48,156. In Switzerland September 15,

6 Claims. 1

This invention is concerned with the manufacture of copperable disand polyazo dyestufis which give dyeings with excellent fastness properties on cotton.

The copperable polyazo dyestuffs are very popular because of their simplicity in use, their very good fastness to light, their sometimes remarkably good fastness under Wet conditions and their cheapness. Their importance has considerably increased in recent years since polyazo dyestufis have been successfully prepared whose coppered dyeings on cellulose have satisfactory fastness properties, even with repeated soap-Washing.

According to the present invention I have found that valuable copperable disand polyazo dyestuffs are obtained when 1 mol of a tetrazotised diamine oi the general formula HzN--ll3-C O-NH-.:\NHG Ol|3NH2 wherein A stands for a 4:4-biphenylene radical and B represents a phenyl radical carrying the amino group in m-position to the carbonyl-group and the hydroxyl group in p-position to the latter,

is coupled with 2 mols of a naphthol-sulfonic acid coupling in the orthg position to the hydroxyl group and which may contain further substituents usual in coupling components and also azo groups. According to the choice of coupling components Bordeaux red to violet dyestuffs are obtained whose coppered dyeings on cellulose are distinguished by remarkably pure shades and extraordinary fastness to repeated soap-Washing.

The diamines used in the invention may be obtained by known methods (see, e. g, Brit. Pat. No. 341,970), for example, from 3-nitro-4-acetoxyor 3-nitro-4-carbolkoxy-benzoyl chloride and a 4:4'-diamino compound of diphenyl, in a water-free organic solvent. It is expedient to carry out the reaction in the presence of an acid binding medium, such as sodium acetate, sodium carbonate, magnesium oxide, or tertiary bases Such as pyridine or dimethylaniline, whereby the solvent or diluent used is chosen according to the solubility of the diamine. During condensation the acyl radical protecting the hydroxyl group is split chi and the intermediate product of Formula I is obtained directly by reduction of the nitro group by the usual methods. When desired the acyl radical can also be removed by gentle hydrolysis before or after reduction in the intermediate product or even when part of the dyestuii molecule. Instead of the 3-nitro-4- acyloxy-benzoyl chlorides named in this patent specification there may be used 3-nitr0-4-hydroxy-benzoyl chloride prepared by the action of thionyl chloride on Smitro-l-hydroxybenzoic acid. The diamino compound of diphenyl can of course have other substituents usual in azo dyestuffs in the aromatic rings, e. g., halogen, alkyl, alkoxy groups, but must contain no ionisable groups such as carboxy or sulfonic acid groups.

The dyestufis from 4:4'-di-(3"amino-4"hydroxy benzoylamino) -3:3' dialkoxy diphenyl have particularly good fastness properties combined with remarkable purity.

Suitable coupling components comprise all naphthol-sulionic acids coupling in a position adjacent to the hydroXyl group. In addition to the substituents usual in azo dyestufis these coupling components may contain further azo groups: particularly aminonaphtholsulfonic acids and derivatives thereof modified at the amino radical. Bordeaux red dyestuffs are given by naphthol-sulfonic acids, while dyestuffs are given by the aminonaphthol-sulfonic acids and their derivatives modified at the nitrogen atom, as well as by acid coupled azo dyestufis capable of coupling from aromatic diazo compounds and amino-naphthol-sulfonic acid. The number of sulfonic acid groups in the copperable polyazo dyestuffs of the invention is chosen so that the latter dyestuffs are sufliciently watersoluble; Two sulfonic acid groups have been found to be a most suitable number.

As is clear from the foregoing, those dyestuffs with the most valuable wet-fastness properties are derived from monosulfonated coupling components, in particular naphthol-monosulfonic acids and aminonaphthol-monosulfonic acids and their derivatives modified at the nitrogen atom. Coupling is often advantageously carried out in the presence of pyridine bases.

The polyazo dyestuffs of the invention can be coppered either in the dyebath or in a fresh bath with the usual copper salts, such as, e. g., copper sulfate or copper acetate, in a neutral or weakly acid medium. When required, copper compounds stable to alkalis can also be used, such as are obtained, for example, when copper sulfate is reacted with sodium tartrate in a bath made alkaline with sodium carbonate.

The following examples illustrate a few of the forms in which the manufacture may be carried out, without restricting it in any way however. Unless otherwise stated, parts are by weight and temperatures in degrees Centigrade.

Example 1 51.4 parts of 4:4'-di-(3-amino-4-hydroxybenzoylamino) -3 3 -dimethoxydiphenyl are dissolved in 600 parts of cold water together with 8 parts of caustic soda lye. 13.8 parts of sodium nitrite are mixed in and the whole added dropwise to 40 parts of concentrated hydrochloric acid with 80 parts of water, the addition being also carried out cold. After the excess mineral EC -Nat acid has been neutralised with sodium carbonate, the greenish yellow suspension of tetrazo compound is added to a cold alkaline solution of 56.2 parts of l-acetylamino-8-hydroxynaphthalene- 4-sulfonic acid and 400 parts of water in the presence of 30 parts of sodium carbonate and 150 parts of pyridine. After stirring for several hours at room temperature coupling is complete. The disazo dyestufi obtained, having the formula:

are used 454 parts of 4:4'di-(3-amino-4"- hydroxybenzoylamino)-dipheny1, 48.2 parts of 4:4 di (3" amino 4" hydroxybenzoylamino)-3:3'-dimethyldiphenyl or 52.5 parts of 4:4 di (3 amino 4" hydroxybenzoylamino) -3 3-dichlorodiphenyl. Otherwise the procedure is exactly as in the above example.

Example 2 51.4 parts of 4:4di-(3"-amino-4"-hydroxybenzoylamino) -3 3' -dimethoxydiphenyl are indirectl tetrazotized, as described in Example 1. the excess mineral acid neutralised with sodium carbonate and the mixture added at a low temperature to an aqueous solution of 80.6 parts of a monoazo dyestufi obtained by acid coupling of diazotized 5 amino 2 hydroxy-benzene-carboxylic acid with 2-amino-5-hydroxynaphthalene-Z-sulfonic acid, 800 parts of water, 40 parts parts of sodium carbonate and 150 parts of pyridine. The reaction mixture is allowed to rise to normal temperature, while stirring. After several hours a tetrakisazo dyestuif of the formula o C-HNOQ-NH-C 00011 on N:N

OCH;

l I omo C-NH on ITO-Q0 CHNO-NHC 000E on NH-C 0 cm is precipitated with common salt, filtered off and dried. The new dyestuif is a dark powder giving a violet solution in water and a red one in concentrated sulfuric acid. It gives after-coppered dyeings in pure violet shades having excellent fastness properties on natural or regenerated cellulose.

Similar violet dyestuffs are obtained if instead of 51.4 parts of 4:4-di-(3"-amino-4"-hydroxyparts of 4:4 di (3"amino-4"hydroxy-6"- chlorobenzoylamino) -3 :3 dimethoxydiphenyl, 54.2 parts of 4:4'-di-(3"-amino-4"-hydroxy-5- inethylbenzoylamino) 3 3 -dimethoxydiphenyl or 514 parts of 4:4-di-(3"-amino-4-hydroxy- 6" methoxybenzoylamino) -diphenyl, otherwise exactly following the above example, there are obtained similar Bordeaux red dyestuffs with benzoylarnino) 3:3 dimethoxydiphenyl there 75 Similar properties- 6 Example 3 stirring, to 40 parts of concentrated hydrochloric acid and 80 parts of water. The excess mineral 45.4 parts of 4:4-di-(3" amino-4"-hydroxyacid is neutralised with sodium carbonate and benzoylamino)-diphenyl are dissolved cold in the greenish yellow suspension of tetrazo com- 600 parts of water with 8 parts of caustic soda 5 pound mixed with a cold alkaline solution of 44.8 lye, mixed with 13.8 parts of sodium nitrite and partsof Z-hydroxy-naphthalene-fi-sulfonic acid added dropwise in the cold, while stirring, to 40 in 400 parts of water, in the presence of 30 parts parts of concentrated hydrochloric acid and 80 of sodium carbonate and 150 parts of pyridine. parts of water The excess mineral acid is neu- After stirring for several hours at room temperatralised with sodium carbonate and the greenish 10 ture coupling is complete. The disaz o dyestuff yellow suspension of tetrazo compound mixed obtained has the formula OCH; OCH;

and is precipitated with common salt, filtered off with a cold alkaline solution of 44.8 parts of 2- and dried. It is a dark powder which dissolves hydroxynaphthalene 4 sulphonic acid in 400 in water giving a violet solution and is concenparts of water, in the presence of parts of sotrated sulfuric acid to give a red one. It dyes doium carbonate and 150 parts of pyridine. cotton or staple fibre in Bordeaux red shades After stirring for several hours at room temperawhich are converted on after-treatment with ture coupling is complete. The disazo dyestuff copper sulfate into a purer Bordeaux having very obtained has the formula good fastness to light and wet conditions.

nois- N=N/ \N=N- soan and is precipitated with common salt, filtered .If instead of with 44.8 parts of 2-hydroxynaphofif and dried. It is a dark powder which disthalene-S-sulphonic acid the dyestufi is built up solves in water giving a violet solution and in with 44.8 parts of l-hydroxynaphthaleneiconcentrated sulfuric acid to give a red one. It sulfonic acid or 44.8 parts of 2-hydroxynaphdyes cotton or staple fibre in Bordeaux red tha1ene-7-sulfonic acid as coupling component, shades which are converted on after-treatment then similar Bordeaux red dyestuffs with similar with copper sulfate into a purer Bordeaux with properties are obtained.

very good fastness properties.

If instead of with 45.4 parts of 4:4'-di-(3"- Example 5 amino-4"-hydroxybenzoy1amino) -diphenyl the dyestllff is built p W t 1.4 Pa ts O Two parts of the dyestufi of Example 1 are (3" m y O yb y1 0)-3 3- d dissolved in a dyebath containing 3000 parts of yp y 48.2 parts of 4I4'- water and 2 parts of sodium carbonate. 100 am o hy oy parts of cotton are entered into the bath at methyldiphenyl or 52.5 parts of 4:4'-di-(3"- l0-50, the temperature raised to, 90-95 within amino-4"-hydroxybenz1oylamino)-3:3'-dichloro- 30 minutes, 30 parts of sodium sulfate are added diphenyl, otherwise exactly following the above and dyeing continued for 45 minutes at this temexample, then similar Bordeaux red dyestuffs perature. The dyed goods arethen rins d cold with similar properties are obtained. and after-treated for 30 minutes at in a fresh bath containing 2 parts of crystallised copper Example 4 sulfate in 2000 parts of water and 2 parts of 30% 70 acetic acid. Rinsing and drying are carried out parts of 4 '-d in the usual manner. The cotton is dyed in pure y 1 h0Xydipheny1 are diS- violet shades with outstanding fastness propersolved cold in 600 parts of water with 8 parts of ti caustic soda lye, mixed with 13.8 parts of sodium To illustrate the invention further a number of nitrite and added dropwise in. the cold, while examples have been collected together in the following table. The method of manufacture is the same throughout as described in the foregoing. In the first column are listed the two the group consisting of H, Cl, CH3 and OCH3, and D represents a carbocyclic naphtholsulfonic acid radical coupled in o-position to its hydroxyl starting materials for the fundamental semi:- group. urea comp n nt, un r n r hydroxybenzoyl 5 2. A disazo dystuff corresponding to the forchloride and diamine. The second column conmula,

OCH; OCH.

tains the coupling component with the hydroxyl group. wherein Y stands for a member selected from Diamine I Reduction product from the benzoylation figg of coppered M I N h at b I m d naphthol-sulfomc acid dyeinlg 0n 2 o. itroy oxyenzoy c ori e ce nose with, 1 M01. diamine fibres l B-hitro-Qhydroxy-benzotlchloride... 4:4-diaminodiphenyl.. l-hydroxy-naphthalenc-4-sulionic bordeaux.

' aci 2 (in I dn 2-hygroxy-naphthaleuc-7-sulf0nic Do.

aci 3 .do 4: 4-diamino-3: 3-dimctl1oxy di- 2-(4-amino-benzoylamino)-5-hyviolet.

phenyl. droxy-naphthalenc-7-sulfouic acid. 4 3-nitro-4-hydroXy-benzoyl chloride .do 2-(3-am1no-benzoylamino) -5- Do.

h groxy-naplithalene-7-sulfonic aci 5 dn ,do 5:5-dihydroxy-2:2-dinaphthyl- Do.

amine-7: 7-di-sulfonic acid. 6 do 4:4-diamino-3 :3-dimethyl-diphenyl do Do. 7 3-n1i1t1ro:a4-hydroxy-5-bromo-benzoy1 4z4-diaminodiphenyl 2-h{groxy-naphtlialenei-sulionic bordeaux.

c on e. aci 8 dn l-hytroxy-naphthalene-4-su1ionic Do.

a 9 3-nitro4- ydroxy-(S-chlorobenzoyl' 2-acetylamino-fi'hydroxy-naphthaviolet.

chloride. v lene-s sulionic acid. do 4:4-diam1no-3:3-dunethy1-dil-benzoylamino-8-hydroxy-naphtha- Do.

phcn lcnei-sulfonic acid. 11 3-nitro-4-hydroxy-5-methyl-benzoyl 4:4-diamino-3:3-d1methoxy-di- Z-benzoylamino-fi-hydroxy-naphtha- Do.

chloride. phenyl. lene-S-sulfomc acid. 12 do .....do 1-methylamino-8-hydroxy-naphtha- Do.

1ei1e-4-sulfon1c acid. 13 B-mtro-4-hydroxy-S-methoxy-benzoyl l-hydroXy-naphthalcne5-sulfonic bordcaux.

chloride. acid. 14 do 2-acetylamino-5-liydroxy-naphtha- Do.

lcne-l-sulfonic acid. 15 3-nitro-4-hydroxy-benzoyl chloridc 4:4-diamino-3:3-dichlorodiphenyl 2-liygroxy-naphthalene-7-su1fonic Do.

ac: 16 do do monoazo: 5-amino-2-hydrcxyben- Do.

zene-carboxylic acid acid J -acid.

do 2-acety1am1no-8-hydroxy-naphtl1aviolet.

lene-B-sulfonic acid. do Z-phcnylamino-5-hydroxy-naphbordcaux thalcne-7-su1fonic'acid. 4:4-d1aminodiphenyl.... 2-amino-5-hydrcxy-naplithalcne- Do.

7-sulfonic .acid. 20 do do Z-amino-fi-hydroxy-naphthalene- Do.

7-sulfonic acid.

What I claim is:

1. A disazo dyestuff corresponding to the mula 3000 C-HN wherein X stands for a member selected from for- NH-CO OH OCH;

OCH:

l0 4. A disazo dyestufi corresponding to the formula 0011 0011, on HO-O-OC-HN-OONH-COQOH on N= N=N 5. A disazo dyestufi' corresponding to the formula 0cm OCH; 0330 ONH on HO-QCO-NH-OGNH-COQOH 0H Nncocn,

-N=N N=N 03H 0,11 6. A disazo dyestuff corresponding to the formula Jon3 wm OH HO-QOOHNQNHCOQOH on N- =N N=N PETER HINDERMANN. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,899,856 Montmollin et a1. Feb. '28, 1933 1,901,387 Wiedemann et a1. Mar. 14, 1933 2,400,092 Anderson May 14, 1946 

1. A DISAZO DYESTUFF CORRESPONDING TO THE FORMULA 